Owner's manual

Using Post Milling Cycles
Chapter 23
23-9
Where : Is:
L
Incrementalplunge depth ofeachcuttingpass along the Z axis. IfL isprogrammed,a finishpass
ismadeateach Llevel. IfLisnotprogrammed,only onefinishing passismadeatthe
programmed Z depth. Thisisan optionalparameter. Itis typically programmed when a verydeep
pocketisbeingfinished.
F
Finishingfeedrate. If notprogrammedtheexisting (modal)feedrate will beused.
In a finishing cycle, a smooth entry to and exit from the finish contour is
accomplished by having the tool approach and leave the finish contour
along a tangential arc. The radius of this arc i s set equal to the tool radius
by the c ontrol. The tangential e ntry/exit point is along the -X or -Y axis
depending on which axis intersects the center of the longer side of the
rectangular post. If the rectangular post is square, the tangential entry/exit
point will be along the -X axis.
Figure 23.3
Rectangular Post Finishing Using G88.4
FINISH CUT PATH
X
Y
EXIT ENTRY
J
r
I
(X, Y)
Q
Q
Important: The t ool should be positioned near the center of the post prior
to the G88.4 block. The Z coordinate of this position determines the initial
Z level or top of the pocket. This is the pre-cycle position of the tool. The
pre-cycle position must be at some depth other than the cycles
programmed final depth or an error is generated.